[PATCH 1/7] ARM: imx: add mmdc ipg clock operation for mmdc

From: Anson Huang
Date: Fri Aug 31 2018 - 03:58:05 EST


i.MX6 SoCs have MMDC ipg clock for registers access, to make
sure MMDC registers access successfully, add optional clock
enable for MMDC driver.

Signed-off-by: Anson Huang <Anson.Huang@xxxxxxx>
---
arch/arm/mach-imx/mmdc.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)

diff --git a/arch/arm/mach-imx/mmdc.c b/arch/arm/mach-imx/mmdc.c
index 04b3bf7..e49e068 100644
--- a/arch/arm/mach-imx/mmdc.c
+++ b/arch/arm/mach-imx/mmdc.c
@@ -11,6 +11,7 @@
* http://www.gnu.org/copyleft/gpl.html
*/

+#include <linux/clk.h>
#include <linux/hrtimer.h>
#include <linux/init.h>
#include <linux/interrupt.h>
@@ -546,7 +547,20 @@ static int imx_mmdc_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
void __iomem *mmdc_base, *reg;
+ struct clk *mmdc_ipg_clk;
u32 val;
+ int err;
+
+ /* the ipg clock is optional */
+ mmdc_ipg_clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(mmdc_ipg_clk))
+ mmdc_ipg_clk = NULL;
+
+ err = clk_prepare_enable(mmdc_ipg_clk);
+ if (err) {
+ dev_err(&pdev->dev, "Unable to enable mmdc ipg clock.\n");
+ return err;
+ }

mmdc_base = of_iomap(np, 0);
WARN_ON(!mmdc_base);
--
2.7.4